Remove Win32k fieldtrial, flag and switches, and make default enabled.

content/public/common/content_switches.h

Index: content/public/common/content_switches.h
diff --git a/content/public/common/content_switches.h b/content/public/common/content_switches.h
index 920aeb50ce46afae622998fadbf02f7a0964b2b3..77d5699e9df65aa8e18a53a18ce460b1fa49eb01 100644
--- a/content/public/common/content_switches.h
+++ b/content/public/common/content_switches.h
@@ -290,10 +290,7 @@ extern const char kDisableThreadedEventHandlingMac[];
 // like renderers, etc.
 CONTENT_EXPORT extern const char kDeviceScaleFactor[];
 CONTENT_EXPORT extern const char kDisableLegacyIntermediateWindow[];
-// This switch will be removed when we enable the win32K lockdown process
-// mitigation.
 CONTENT_EXPORT extern const char kDisableWin32kRendererLockDown[];
-CONTENT_EXPORT extern const char kEnableWin32kRendererLockDown[];
 CONTENT_EXPORT extern const char kMemoryPressureThresholdsMb[];
 // Switch to pass the font cache shared memory handle to the renderer.
 CONTENT_EXPORT extern const char kFontCacheSharedHandle[];